Multiple Choice

A manufacturing estimator is using the difference of squares pattern a2b2=(ab)(a+b)a^2 - b^2 = (a - b)(a + b) to factor the expression $121x^2 - 49y^2$ for a material-cost calculation. To apply this pattern correctly, which values must the estimator recall and identify as a and b?

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Updated 2026-04-21

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